Method for producing all solid state battery and all solid state battery

A method for producing an all solid state battery including a first current collector, a first active material layer, a solid electrolyte layer, a second active material layer and a second current collector stacked in this order, the method comprising:

• a transferring step of transferring a transfer layer onto the first current collector by using a transfer member including a transfer foil and the transfer layer, the transferring step being included in a step of forming at least one layer of the first active material layer, the solid electrolyte layer, and the second active material layer, and
• the transfer layer includes a binder, and in a thickness direction, a binder concentration of a surface portion on opposite side to the transfer foil is higher than a binder concentration of a surface portion on the transfer foil side,
• the solid electrolyte layer contains a sulfide electrolyte.